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Analytical Studies Services
Through our leadership and expertise in all aspects of power delivery, S&C’s professionals have become some of the industry’s leading experts in the analysis of complex power systems. Our unparalleled design and testing skills have helped customers around the world plan and implement their power systems. S&C offers a variety of analytical studies that support system planning, reliability, and protective device coordination. Using state-of-the-art technology, models, and software, our teams apply their knowledge throughout all phases of the project life cycle. From electrical equipment recommendations to system analysis, the use and application of these studies have resulted in substantial savings for our customers.Coordination studies are used to select appropriately rated protective devices and settings, to ensure that transformers, capacitor banks, electric motors, and cables are properly protected against damage from short-circuit currents. The objective is to minimize the impact of short-circuits by isolating them as quickly as possible, while maintaining power to the rest of the system.
S&C uses the latest software tools — CYMTCC for Windows® and SKM CAPTOR — to generate the time-current characteristic curves for all protective devices on each feeder. Coordination studies for industrial and commercial facilities are performed in accordance with industry-accepted practices and procedures, consistent with ANSI/IEEE Standard 242-2001, IEEE Recommended Practice for Protection and Coordination of Industrial and Commercial Power Systems. Coordination studies for electric utilities are based on their specific fusing and reclosing practices.
Short-circuit studies determine the currents that flow in a power system under fault conditions. Since growth of a power system often results in increased available short-circuit current, the momentary and interrupting ratings of new and existing equipment are checked to ensure the equipment can withstand the short-circuit energy and associated magnetic forces. Fault contributions from utility sources, motors, and generators are taken into consideration. The results of the study are also used to selectively coordinate electrical protective devices.
S&C uses the latest short-circuit analysis software, including Power System Analysis Framework-Fault, SKM DAPPER, and CYMDIST to calculate three-phase, line-to-line, and line-to-ground fault currents at relevant locations on the power system, in accordance with either ANSI or IEC Standards. A closing-and-latching duty analysis can also be performed to calculate the maximum currents following fault inception.